The Tempietto is a small commemorative tomb designed by Donato Bramante, to mark the location of the crucifixion of St Peter. It was possibly built as early as 1502 in the courtyard of San Pietro in Montorio, in Rome, Italy. Commissioned by Ferdinand and Isabella of Spain, the Tempietto is considered a masterpiece of High Renaissance Italian architecture.
After spending his first years in Milan, Bramante moved to Rome, where he was recognized by Cardinal Giuliano della Rovere, the soon-to-be Pope Julius II. In Rome, Bramante was able to study the ancient monuments firsthand. The temple of Vesta at Tivoli was one of the precedents behind the Tempietto.
Wikipedia https://en.wikipedia.org/wiki/Tempietto_del_Bramante
Address 1 Piazza di San Pietro in Montorio, Roma 00153, Italy
Coordinates 41°53'19.456" N 12°27'59.016" E